As someone who has experienced an alien abduction or seen an alien, can you explain what happened?
I see UFOs on an almost daily basis. They are NOT interstellar beings in a material sense, this planet or plane of existence is theirs as well. The best way I can explain an interaction with these transdimensional entities is they interface with the world we exist in. Wherever it is they come when they abduct a person that place becomes the craft itself in a sense, such as your bedroom. It's as if the room is now in or part of the craft itself. The UFOs can manipulate time, space, and mind. The craft itself seems to be sentient as much as you or I or the beings on the ship reacting to the thoughts of the larger insectoid/mantids who seem to be the higher caste, the "greys" being several different castes of worker drones.
These are not new, they have been here for a very long time.